OK, I will now write few things which will be lost in this thread in about few pages but nevermind, I love my scribomanicism during morning coffee.
Nurburgring Nordchleife in Forza series is not inaccurate because of Turn10, but because of Bizzare Creations. However, it is 100% Turn10's blame that they didn't took any time to actually fix the inaccuracies for their *simulation* game.
As many probably do not know, Turn10 is using Nurburgring track-model created by Bizzare Creations for their Project Gotham series. Bizzare created the original mesh for their PGR2 and premiered the actual circuit on the consoles. Contrary to usual belief it was PGR2 that initially introduced The Green Hell to console public in 2003, to be followed by Polyphony Digital's much more accurate representation initially shown in promotional-disc for BMW Series 1, months prior to GT4 release (that same model will be used in GT4).
Usual collaboration among Microsoft Games studios since gave Turn10 an easy way to introduce Nordschelife in Forza Motorsport 2. When you take side-by-side replays of PGR2 and FM2 Nordschelife you will easily see it is the exact same model.
Bizzare intentionally opted to make Nurburgring wider, less sloped and easier to drive because of overall logic of their Gotham series in order to make core of their gameplay mechanic more accessible. Problem is that Turn10 actually just took the mesh and designed the visual around it, without correction of the original mesh. And through all these years, they're just reusing that same mesh all-over-again. Nordschleife model in Forza 4 in 2011 is still the same basic model used in Project Gotham 2 in 2003.
I am really disappointed because of it. You can call me elitist, bash on me or whatever, but I really can't understand why they insist to continue that questionable praxis for last 5 years. What is even more ridiculous is they really have the budget size of mountain and they pay 3 outsourced-companies to model the tracks for them (Rabcat and Acme are doing only cars).
And as I have already said elsewhere, it it really beyond my comprehension that
Turn10 travelled all the way to Switzerland - and the main track-design guy was also there - in order to took assets and design the Bernese Alps track, which is 100% fictional track. But they didn't travel few hundred kilometres more to neighbouring Germany in order to take assets and correct the Nurburgring Nordschelife.
And in this same universe, Takuro Eika and his 3 (three) members of track team did one of the best virtualization when actual track-model is concerned for
Konami's Enthusia Professional Racing in 2005 with budget probably laughable compared to one available to Turn 10.
I don't know, I really think that they simply do not care. After all this years and all time I've spent playing Forza games, I really think they simply just don't give a F.